EP2274582A1 - Measuring apparatus and method for monitoring a measuring apparatus - Google Patents
Measuring apparatus and method for monitoring a measuring apparatusInfo
- Publication number
- EP2274582A1 EP2274582A1 EP09741982A EP09741982A EP2274582A1 EP 2274582 A1 EP2274582 A1 EP 2274582A1 EP 09741982 A EP09741982 A EP 09741982A EP 09741982 A EP09741982 A EP 09741982A EP 2274582 A1 EP2274582 A1 EP 2274582A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- measuring
- meter
- esp
- electronics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/061—Indicating or recording devices for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Definitions
- the invention relates to a, especially as a measuring and / or switching device of industrial measurement and automation technology trained and / or electronic, measuring device for measuring and / or monitoring at least one measured variable of a guided in a pipe and / or a container medium. Moreover, the invention relates to a method for monitoring such a measuring device, which has a at least partially housed in a, esp. Grounded, housing Meßwandier and at least temporarily connected to the transducer instrument electronics.
- process-installed electrical measuring and / or switching device called field devices, such as Coriolis mass flow Measuring instruments, density measuring instruments, electromagnetic flowmeters, vortex flowmeters, Uitraschall flowmeters, thermal mass flow meters, pressure gauges, level gauges, temperature measuring instruments, ph value measuring instruments, etc., used, the generation of process variables - analog or digital - representing measured values and these ultimately bearing Meß sectionnalen serve.
- the process variables to be detected may be, for example, a mass flow rate, a density, a viscosity, a filling or a limit level, a pressure or a temperature or the like of a liquid, powdery, vaporous or gaseous medium act, which is in a corresponding container, such as a pipe or a tank, guided or maintained.
- the respective process variables Feidgerate of the aforementioned type each have a corresponding physical-electrical or chemical-electrical transducer.
- This is usually in a wall of the medium respectively leading container or in the course of the medium respectively leading line, such as a pipe, used and serves to at least one corresponding to the process variable to be detected corresponding electrically Meßsigna!
- the measuring transducer is further provided with a measuring device internal operating and measuring device provided in a field device electronics of the field device, the further processing or evaluation of the at least one measuring signal as well as the generation of corresponding measured value signals
- the transducer for generating the Meßsignais in operation is also driven by one of the operating and evaluation circuit at least temporarily generated driver signal so that it is suitable in a suitable manner for the measurement, at least indirectly or over a probe which directly contacts the medium acts practically directly on the medium in order to correspondingly correspond therewith to the measured variable to be detected
- the driver signal can be regulated accordingly, for example, with regard to a current intensity, a voltage level and / or a frequency.
- an electrical driver signal in the medium corresponding to transducing transducers are in particular the measurement of at least temporarily serving flowing media flow transducer, eg with at least one of the driver signal driven, magnetic field generating coil or at least one driven by the driver signal Uitraschallsender, or also the measurement and / or monitoring of levels in a container serving level and / or Grenzstandsaufêt, such as with radiating microwave antenna, Gouboun cable or vibrating body.
- Devices of the type in question also have at least one housing with at least one electrical, electronic and / or electro-mechanical components and / or assemblies of the device, such as components of the mentioned operation and Ausenseschaitung, receiving, usually pressure-tight and / or explosion-proof sealed chamber on.
- field devices of the type described for receiving the field device electronics usually comprise a comparatively robust, in particular impact, pressure, and / or weatherproof, electronic housing.
- the respective field device electronics are usually electrically connected via corresponding electrical lines to a superordinate electronic data processing system, which is usually remote from the respective device and usually also spatially distributed, to which the measured values generated by the respective field device are forwarded in a timely manner by means of a measured value signal corresponding thereto ,
- Electrical devices of the type described are also usually by means of a provided within the parent data processing system data transmission network and / or associated with appropriate electronic process controls, such as locally installed programmable logic controllers or installed in a remote control room process control computers, where by the electronic device generated and suitably digitized and encoded accordingly measured values.
- process control computers By means of such process control computers, the transmitted measured values can be further developed and visualized as corresponding measurement results, for example on monitors, and / or converted into control signals for other field devices designed as actuating devices, such as solenoid valves, electric motors, etc.
- the operating data assigned to the electronic device sent in the same way via the aforementioned, usually in terms of transmission physics and / or the transmission logic hybrid data transmission networks. Accordingly, the data processing system is in the event that the electronic device is designed as a field device of the aforementioned type, esp. Also as a measuring device, usually also to the supplied by the electronic device measured value signal according to the requirements Conditioned downstream data transmission networks, for example, suitable to digitize and, where appropriate, implement in a corresponding TeJegramm, and / or evaluate on site.
- such higher-level data processing systems usually also supply the connected measuring and / or switching devices with electric power supply circuits which have a corresponding, possibly directly connected, supply Fieldbus supplied, provide supply voltage for each field device electronics and drive the electrical lines connected thereto and the respective field device electronics flowing electric currents.
- a supply circuit can, for example, be associated with exactly one field device in each case and together with the evaluation circuit assigned to the respective field device-for example, combined into a corresponding feeder bus adapter-in a common, eg, DIN rail module! trained, housed electronics housing.
- Protection requirements are sufficient, in particular with regard to the partitioning of the electrical components placed therein against external environmental influences, with regard to protection against any possible contact with live components and / or with regard to the prevention of electric sparking in the event of a fault.
- This includes, for example, as also described in DE-A 100 41 166, in particular the requirement that an electrical leakage current, for example, at body or shunt due to defective cable insulation or infoige conductive pads, via housing gen or ground could flow , may not exceed a maximum allowable value. For example, if the electrical device is connected to 250 V, this maximum permissible value is 10 mA. If these requirements are met, the device complies at least with the requirements of protection class 1 1, ie it is an electrical device with protective insulation.
- the housing of the electrical device is sufficiently isolated from all live parts of the device.
- Such insulation is particularly necessary if it is a housing made of electrically conductive material, for example a metal.
- the insulation resistance between the housing and instrument electronics at least initially substantially greater than 1 M ⁇ , on the order of 10 M ⁇ or above, while such leakage currents enabling electrically conductive connections between housing and meter electronics may have an electrical resistance which may be less than the initial isolation resistance, especially less than 1 M ⁇ or even less than 500 k ⁇ , for more than a decade.
- electrical devices that are to be operated in potentially explosive areas must also meet very high safety requirements with regard to explosion protection.
- the ignition or explosion protection achieved in that the spatial distances between two different electrical potentials are so great that a sparking can not occur even in case of error due to the distance.
- this can lead to Schaestungsan extract must have very large dimensions in order to meet these requirements.
- the European standard EN 50 018: 1994 also specifies the type of protection "flameproof enclosure" (Ex-d). Electrical devices that are designed in accordance with this Schutzkiasse must have a flameproof enclosure, which ensures that an explosion occurring inside the housing can not be transferred to the outside.
- Pressure-resistant housings are designed to be comparatively thick-walled so that they have sufficient mechanical strength. In the USA, Canada, Japan and other countries, there are comparable standards with the aforementioned European standards.
- the measuring device electronics are to be repeatedly checked for their integrity in order to be able to detect any impending device errors as early as possible.
- the integrity of the associated measuring device electronics is often tested by a corresponding electronic measuring and test circuit, by means of the line and insulation resistances can be measured externally via corresponding service connections to the Meß réelle- Electronics connected and a corresponding impedance measurement on individual modules and / or lines of the meter electronics is performed, possibly accompanied by a temporary interruption of the actual measurement operation.
- An object of the invention is therefore to improve the verification of operating conditions and / or the reliability of electrical equipment of the aforementioned type, esp. Of their respective electronics to the effect that early detection of impending error conditions within the meter electronics such about caused by conductive pads and / or insulation failure body and / or shunt, is possible, possibly even without significant limitation of the actual measurement operation and / or in the course of a from the measuring device recurring and / or automatically performed diagnosis.
- the invention consists in a, esp. Designed as a measuring and / or switching device of industrial measurement and automation technology and / or electronic, measuring device for measuring and / or monitoring at least one measured variable in a pipeline and / or a container guided medium, which comprises measuring instrument:
- At least one measuring channel for detecting and processing at least one primary signal generated by means of the measuring wall, and a current measuring circuit for detecting measuring device having internally flowing electrical currents,
- the invention consists in a method for monitoring a, in particular.
- a measuring and / or Schaitterrorism the industrial measuring and automation technology trained and / or electronic, measuring device that at least partially in one, esp. Grounded and / or Metallic, housing housed transducer and a connected to the transducer at least temporarily connected measuring device electronics, which method comprises the following steps-
- the Potentlaidifferenz between the housing and Meßgerat- electronics is formed by the fact that the housing to a first electrical reference potential and at least one component of the meter electronics, esp the measuring channel, at least temporarily to a from first electrical reference potential different second electrical reference potential are placed.
- This embodiment of the invention further provides that the housing is grounded to form the first electrical reference potential, and / or that the meter electronics is also temporarily at the first electrical reference potential.
- this further comprises at least one at an output, esp. At least temporarily substantially constant and / or clocked and / or pulse-shaped, output voltage supplying source circuit comprises. Further developing this embodiment of the invention, the output of the source circuit for generating a between housing and Meß réelle- electronics existing potential difference during operation at least temporarily, esp. Permanently, electrically connected to the housing.
- the Banienscen is formed so that the output voltage, esp. Abruptly and / or stepwise, is variable.
- the source circuit is formed so that its output voltage is an AC voltage, esp. Of variable frequency.
- the measuring device electronics further comprise, in particular by means of a resistor network serving as a voltage divider and / or current limiter and / or by means of a voltage rectifier and / or as
- Voltage limiting serving diode circuit formed, filter circuit which, esp. By means of switch, during operation at least temporarily, esp. Permanently, both to the output of the source circuit and to the housing is electrically connected.
- the measuring device electronics further comprises a Wäderstandsnetz serving as a voltage divider and / or current limiter, which, esp. By means of switch, during operation at least temporarily, esp. Permanently, both electrically connected to the output of the source circuit and to the housing.
- the at least one Meßkanai is operated with a meter internal useful voltage
- the Banienschaitung is designed so that their output voltage and / or the potential difference between the housing and meter electronics at least temporarily 50% of the internal useful voltage is set.
- the useful voltage also serves to operate the source circuit.
- the source circuit is designed so that their output voltage for forming the potential difference between the housing and meter electronics is a maximum of 40 volts, esp. Less than 32 volts, and / or that the potential for driving the leakage current potential difference between the housing and meter electronics is always kept smaller than 40 volts, esp. Not more than 32 volts.
- the leakage current enabling electrically conductive connection between the housing and meter electronics on a eiektrischen resistance, the, Specifically, by more than a decade, less than an initial insulation resistance between the package and meter electronics and / or less than 1 M ⁇ , especially less than 500 K ⁇ .
- an initial insulation resistance between the housing and the measuring device electronics is greater than 1 M ⁇ , in particular greater than 10 M ⁇ .
- the current measuring circuit comprises a sense current through which a leakage current flows, above which a voltage substantially proportional to the leakage current drops.
- the measuring device electronics has at least one comparator for comparing the detected leakage current with at least one predetermined, esp. Also revised, threshold value.
- the measuring device electronics generates an alarm based on the leakage current detected by the current measuring circuit, which signals the occurrence of an error, especially in the housing due to undesirable formation of lettable pads within the housing.
- this further includes a display element for visualizing meter internally generated error messages, esp. A generated based on the detected by the current measurement circuit leakage alarm.
- the meter electronics based on the current detected by the current measuring circuit leakage at least one, Insb. digital, state swert generated, one, in particular erroneous, operating state of the measuring device currently represents.
- This embodiment of the invention further educated is further provided that the meter electronics based on the condition value generates an alarm that signals the occurrence of a, esp. By undesirable formation of conductive deposits within the housing, error in the meter.
- the current measuring circuit has at least one A / D converter for digitizing the detected leakage current
- the meter electronics further comprises a communicating at least temporarily with the current measuring circuit via A / D converter microcomputer, the generates the at least one state value based on the leakage current detected and digitized by the current measuring circuit.
- the measuring device electronics further comprise, in particular at least temporarily with the current measuring circuit and / or at least temporarily communicating with the source circuit, microcomputer.
- the current measuring circuit has at least one A / D converter for digitizing the detected leakage current, which A / D converter supplies a digital signal representing the detected leakage current at least temporarily at an output.
- the potential difference between the housing and Meß réelle- electronics is formed by the fact that the housing on a first electrical reference potential and at least one component of the Measuring device electronics, in particular a Meßkana! for detecting at least one generated by the transducer primary signal, at least temporarily lie on a different from the first electrical reference potential second electrical reference potential.
- the housing is grounded to form the first electrical reference potential and / or wherein the meter electronics is also temporarily at the first electrical reference potential.
- this further comprises a step of, esp. Jumping and / or stepwise and / or periodic, changing at least one reference potential of the meter electronics for generating the potential difference between the housing and meter electronics,
- this further comprises a step of galvanically connecting an output of provided within the meter electronics, one, esp. At least temporarily substantially constant and / or pulsed and / or pulse, output voltage supplying source circuit with the housing, esp. With the interposition of a current and / or voltage-limiting acting filter circuit for Bälden the potential difference between the housing and meter electronics includes.
- this further comprises a step of using the at least one state value to generate an alarm indicating the occurrence of, in particular, undesired formation of conductive deposits within the housing, signaling error in the meter.
- this further comprises a step of using the at least one state value for triggering a display element which is at least temporarily, in particular momentarily, communicating, in particular also generated by the measuring device, with the measuring device electronics ,
- this further comprises a step of comparing the at least one state value with at least one predetermined, in particular also revisable, threshold value.
- the meter electronics at least one operated with a meter internal useful voltage Meßka ⁇ al for detecting at least one generated by the transducer primary signal, and wherein the potential difference between the housing and Meß réelle- electronics at least temporarily 50% of the internal useful voltage is set.
- the potential difference between the housing and meter electronics for driving the leakage current to 40 volts or less, esp. Less than 32 volts is set.
- this further comprises a step of generating at least a primary signal by means of the transducer, which corresponds to at least one measured variable of a in one, esp. electrically grounded, pipeline and / or a, esp. electrically grounded, container guided medium comprises.
- a basic idea of the invention is to carry out the checking of operating states and / or the operational safety of electrical devices of the aforementioned kind, in particular also of their respective electronics, with "on-board" measuring means, such as the aforementioned current measuring circuit and / or the aforementioned source circuit. esp. Also automatically or semi-automatically in dialogue with the user, if possible without interruption or at least without significant limitation of the actual measurement operation.
- Fig. 1 schematically in a perspective rare view
- Fig. 2 shows schematically a partially sectioned side view of a first variant of, esp. As an insertable into a pipeline in-line measuring device for measuring at least one parameter of a guided in the pipeline medium ⁇ measuring instrument of FIG. 1, and
- Fig. 3 shows schematically a partially sectioned side view of a second variant of, esp. As a ⁇ formed in a pipe insertable in-line measuring device for measuring at least one parameter of a run in the pipeline medium, the measuring device of FIG. 1.
- Fig. 1 is a, esp. As a measuring and / or switching device of industrial measurement and automation technology trained, measuring device shown.
- the measuring device has at least one, in particular metallic and / or nodular, housing 100, in which electrical, electronic and / or electro-mechanical components and / or groups of the measuring device are accommodated.
- the measuring device is intended to be used for measuring a physical and / or chemical measured quantity of a medium which is guided in a, in particular electrically grounded, pipeline and / or in a, in particular electrically grounded, container.
- the measuring apparatus may be, for example, a Coriolis mass flowmeter, a density meter, a magnetic induction flowmeter, a vortex flowmeter, an ultrafast flowmeter, a thermal mass flowmeter, a pressure gauge, a level gauge Temperature meter or the like act.
- the measuring device electronics 2 may be formed comprising the measuring device electronics 2, a, in particular by means of a microcomputer .mu.C formed, evaluation and operating circuit 20 at least for example, at least operated a proportionately means of the above useful voltage..
- Measuring channel 2OA for detecting and processing of at least one generated by the Meßwandiers MW and abnos to be detected by the measured variable ngigen and so far with this corresponding primary signal s1, for example, a measuring voltage or a measuring current.
- the measuring channel 20A may further comprise a corresponding A / D converter.
- the measuring device further includes a at least temporarily communicating with the meter electronics adoseiement AE, such as a in Housing placed LCD or TFT display.
- a Co ⁇ olis Massen pressflußmeßgerat, Dichtemeßgerat, Viskosticiansmeß réelle or the like formed, in-line Meßgerat is inserted by means of suitable flange 101, 102 in the course of a - not shown here - pipeline and serves for measuring and / or monitoring at least one Parameters, such as a mass flow, a density, a viscosity, etc., of a flowing medium in the pipeline.
- the Meßwandier serves in the measuring device shown here to produce in a medium flowing through mechanical reaction forces, eg masse knockflußcoole Co ⁇ olis forces, density-dependent inertia forces and / or viscosity-dependent frictional forces, which act back sensory detectable on the transducer. Derived from these reaction forces, it is thus possible to measure a mass flow rate m, a density and / or a viscosity of the medium in the manner known to those skilled in the art.
- transducer at least one - in the exemplary embodiment shown here substantially straight - measuring tube 10, which is vibrated during operation and thereby oscillating to a static rest position repeatedly elastically deformed
- WO-A 03/095950 WO-A 03/095949, WO-A 95/16897, US-A 2005/0139015, US-B 69 10 366, US-B 66 91 583, US-A 60 41 665 US-A 60 06 609, US-A 56 16 868, US-A 52 53 533 -einem straight measuring tube, but could also transducers with parallel straight measuring tubes, as described for example in US-A 52 18 873 or US-A 56 02 345 are shown be used or with parallel curved measuring tubes, as described, inter alia, in US-B 67 11 958, US-B 65 05 519, US-A 57 96 01 1, US-A 53 49 872, the US-B 67 11 958, US-B 65 05 519, US-A 57
- transducer with only a single curved measuring tube, such as from WO-A 07/130024, US-A 41 87 721, US-A 50 69 074, US-B 64 84 591 or US -B 66 66 098 known or with a helical measuring tube, such as from US-A 49 57 005 known to use.
- the measuring tube 10 for the purpose of generating - here as Schwingungsmeßsignale trained - primary signals s1, s2 at least temporarily, esp. Formed as lateral bending vibrations in an imaginary vibration level, vibrations in a Nutzmode, esp. In the range of a natural resonant frequency of a corresponding natural vibration mode, stimulated.
- Coriolis forces are induced by means of the vibrating measuring tube 10 in the medium flowing through it.
- the counter-oscillator 13 can be designed in a tube-like or box-shaped manner and, for example, connected to the measuring tube 10 at the inlet end and at the outlet end such that it is aligned substantially coaxially with the measuring tube 10 and thus the measuring tube 10 is at least partially encased by the counteroscillator 13.
- the counter-oscillator 13 is designed to be heavier than the measuring tube 10.
- the measuring tube 10 is also on the inlet side in the region of the first coupling zone opening inlet pipe section 1 1 and on the outlet side in the region of the second coupling zone opening, esp. To Eänlagirohr La 1 1 substantially identical, Auslenfinrohr La 12 corresponding to the medium on or laxative - Not shown here - connected pipeline.
- Auslstrarohr binding 12 are substantially straight executed in the embodiment shown and aligned with each other, the measuring tube 10 and to a coupling zones practically connecting imaginary longitudinal axis L in alignment.
- measuring tube 10, inlet and outlet pipe piece 1 1, 12 be made in one piece, so that to the
- inlet tube piece 1 1 and outlet tube 12 are each formed by segments of a single, ein Foundationigen tube, these, if necessary, but also by means of individual, subsequently assembled, eg welded together, semi-finished become.
- any of the conventional materials such as steel, titanium, tantalum, zirconium, etc., or even corresponding combinations of these materials can be used.
- the use of titanium or zirconium for straight measuring tubes has been found to be particularly suitable, while, for example, for reasons of cost savings for Wandtergephinuse 100 as well as the optional counter-oscillator, the use of steel is quite beneficial.
- the transducer further comprises an electrically connected to the meter electronics, such as electrodynamic exciter arrangement with a - fixed here on the counter-oscillator 13 - and fixed to the measuring tube 10 - not shown here - permanent magnet rastwirke ⁇ de exciter coil 40th
- the exciter arrangement serves to inform an electrical exciter energy E ⁇ XC fed into the measuring tube 10, eg pulse-shaped, clocked or harmonic, by means of the operating and evaluation circuit 20 informing a suitably conditioned electrical drive signal, eg with a regulated current and / or a regulated voltage , acting and this in the manner described above elastically deforming excitation force F exc convert.
- the exciter force F exc may be bidirectional or else unidirectional and may be adjusted in terms of its frequency in a manner known to those skilled in the art, for example by means of a current and / or voltage control circuit, in terms of their amplitude and, for example, by means of a phase-locked loop.
- the excitation order, as well with such transducers quite common also designed and arranged in the transducer that it acts substantially centrally of the measuring tube and / or at least selectively fixed along an imaginary central peripheral line of the measuring tube outside of this.
- a sensor arrangement which is known to those skilled in the art, by means of an inlet side of the measuring tube 10 - not shown here - permanent magnets and interacting with this - fixed here on the counter-oscillator 13 - first
- connection lines are provided, which are at least partially guided within the Wandiergephases.
- the leads may be at least partially as electrical, at least partially formed in wrapped by an electrical insulation wires, e.g. inform of "twisted-pair" cables, ribbon cables and / or coaxial cables.
- the connection lines can also be formed, at least in sections, by means of conductor tracks of a, in particular flexible, optionally painted circuit board, cf. this also the aforementioned US-B 67 1 1 958 or US-A 53 49 872.
- a resistor - electrically conductive connection RF is formed, for example due to the housing Be fallendem pad and / or as a result of formed inside the housing condensation and / or as a result of penetrating into the housing medium at leak-beaten transducer and / or leaky housing, on the operation may disturbing leakage currents may flow.
- the electrical resistance of such a conductive connection can be smaller than an initial insulation resistance between the housing and the measuring device electronics by more than a decade, in particular also less than 1 M ⁇ .
- the measuring device is also provided with the meter electronics targeted at least temporarily a potential difference ⁇ U 12 between housing 100 and meter electronics ME to generate a defined leakage current IL 1, for example, in the order of about 100 nA to about 100 uA, both by the meter electronics ME and in the further course by such, with this potential difference .DELTA.U 12 coexisting electrically Iitfahige connection RF of the aforementioned Art drives.
- the current due to the at least currently existing between housing 100 and meter electronics ME potential difference .DELTA.U 12 and the at least currently existing electrically conductive connection Rp flowing leakage current i L by means of the meter electronics is detected accordingly to based thereon at least to generate a state value Z, which currently represents the current - by definition erroneous or at least undesirable - operating state of the measuring device.
- the potential difference ⁇ U 12 between housing 100 and instrument electronics ME which drives the leakage current can be formed in a simple manner, for example, by housing 100 at a first electrical reference potential U i, in particular a ground potential, and at least one component of the instrument electronics ME, esp.
- the at least one measuring channel 2OA at least temporarily and / or at least proportionately placed on a different from the first electrical reference potential Ui second electrical reference potential U 2 , for example, to about 50% of the supplied from the internal supply circuit 30 useful voltage UN
- the Meßgerat- ESektromk also has a detecting the internally in the meter flowing electrical currents serving, for example, in the evaluation and operating circuit 20 integrated and / or at least temporarily in operation with the microcomputer ⁇ C communicating current measuring circuit 2OB, the at least temporarily, in particular recurrently, an electrical leakage i ⁇ _ detected, due to the at least temporarily between housing 100 and meter electronics ME existing Potent ⁇ ald ⁇ fferenz .DELTA.U- 12 and also between housing 100 and meter electronics ME existing aforementioned electrically conductive connection RF by selbige as well as within the meter electronics ME itself flows.
- the current measuring circuit further comprises 2OB for a detection of the driven by the potential difference .DELTA.U 12 leakage current I L serving sense resistor Rs, which are present at least during the operation of an electrically conductive connection between Meßgerat- electronics ME and housing 100, optionally in the of the as previously described, leakage current IL has leaked through, so that a voltage which is substantially proportional to the leakage current I 1 , R s • L, drops over it.
- the current measuring circuit 2OB comprises at least one digitizing the detected leakage current IL serving A / D converter, the at least temporarily at an output a detected leakage current I L digital representing digital signal supplies.
- the meter further comprises a, insb, also by means of the supply circuit 30 and with the provided therefrom internal useful voltage U N , source circuit QS, the one, for example, at least temporarily substantially constant and / or clocked and / or pulse-shaped at one output and / or periodic output voltage.
- the source circuit QS can also be designed so that their output voltage and so far also the thus set reference potential U 2 of the meter electronics in magnitude and / or sign, for example, leaps and / or gradually and / or cyclically, can be changed and / or that its output voltage is an AC voltage, esp. Of variable frequency.
- the control of the source circuit QS or the output voltage provided therefrom can be effected, for example, by means of the microcomputer ⁇ C, which may be provided in the meter electronics ME, which accordingly communicates with the unit at least temporarily during operation.
- the output of the source circuit QS is at least temporarily in operation, at least for the purpose of generating the potential difference ⁇ U 12 driving the leakage current I L.
- the housing is grounded thus also the meter electronics temporarily, esp. Also during the regular measuring operation, and / or at least proportionately also on the first electrical reference potential U 1 - here earth potential - are placed.
- the source circuit QS is further designed according to a further embodiment of the invention, that the output voltage and / or the adjusted potential difference .DELTA.U 12 between the housing and meter electronics at least temporarily substantially equal to about 50% of the internal useful voltage U N.
- the output voltage and / or the adjusted potential difference .DELTA.U 12 between the housing and meter electronics at least temporarily substantially equal to about 50% of the internal useful voltage U N.
- the source circuit QS can also be designed, for example, in such a way that its already forming the potential difference ⁇ U 12 between the housing and the measuring device electronics Serving output voltage 40 volts maximum, msb. less than 32 volts, amounts
- the filter circuit FS can be formed, for example, by means of a resistance divider serving as a voltage divider and / or as a current limiter and / or by means of a diode circuit serving as a voltage equalizer and / or as a voltage limiter.
- the optionally provided in the meter electronics, serving as a voltage divider and / or current limiter for the leakage current resistor network and possibly provided in the meter electronics, aspalsgieich ⁇ chter and / or as a voltage limiter for the output voltage of the source circuit QS serving diode circuit can - as indicated schematically in FIG. 2 or 3 - in operation, for example by means of a switch, to be electrically connected to the output of the source circuit QS and / or to the housing 100, be it permanent or even temporary.
- the meter electronics ME generates based on the detected by the current measuring circuit leakage current IL, for example by means provided in the measuring and Radioschaitung 20 microcomputer ⁇ C, at least one, esp. Digital, state value Z, the operating state of the meter
- the meter electronics according to a further embodiment of the invention further at least one, optionally also by means of the microcomputer ⁇ C communicating via the A / D converter with the current measuring circuit, comparator for comparing the detected leakage current!
- the meter electronics ME based on the detected by the current measuring circuit leakage current I L or based on the state value Z, a directly detectable on-site, the alarm generates the occurrence of a, esp.
- the state value Z can then be used to control the display element AE which at least momentarily communicates with the measuring instrument electronics ME, for example translates into a corresponding clear text error message, an error code and / or an alarming color value for the A Display element AE and / or used to generate a switching command which serves to intervene in the process monitored by means of the then defective measuring device.
- the state value Z and / or the alarm derived therefrom can also be applied to the measuring device during operation communicating parent electronic data processing system, eg wirelessly by radio and / or wired, to be sent
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008022373A DE102008022373A1 (en) | 2008-05-06 | 2008-05-06 | Measuring device and method for monitoring a measuring device |
PCT/EP2009/054870 WO2009135764A1 (en) | 2008-05-06 | 2009-04-23 | Measuring apparatus and method for monitoring a measuring apparatus |
Publications (2)
Publication Number | Publication Date |
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EP2274582A1 true EP2274582A1 (en) | 2011-01-19 |
EP2274582B1 EP2274582B1 (en) | 2021-06-09 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09741982.4A Active EP2274582B1 (en) | 2008-05-06 | 2009-04-23 | Measuring apparatus and method for monitoring a measuring apparatus |
Country Status (6)
Country | Link |
---|---|
US (1) | US7886614B2 (en) |
EP (1) | EP2274582B1 (en) |
CN (1) | CN202119489U (en) |
DE (1) | DE102008022373A1 (en) |
RU (1) | RU2502961C2 (en) |
WO (1) | WO2009135764A1 (en) |
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Also Published As
Publication number | Publication date |
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WO2009135764A1 (en) | 2009-11-12 |
EP2274582B1 (en) | 2021-06-09 |
US7886614B2 (en) | 2011-02-15 |
DE102008022373A1 (en) | 2009-11-12 |
RU2502961C2 (en) | 2013-12-27 |
RU2010149870A (en) | 2012-06-20 |
US20090277278A1 (en) | 2009-11-12 |
CN202119489U (en) | 2012-01-18 |
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